Millstone-mounting



(No Model.)

B. D. SANDERS.

MILLSTONB MOUNTING.

No. 246,560. Bmmnted Aug. 30,1881.

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N. PETERS. PnuluLilhogmpher. washington, D. C.

BENJAMIN D. SANDERS, 0F GROSS CREEK DISTRICT, (WELLSBURG, P. 0.,)

' PATENT OFFICE.

WEST VIRGINIA.

NIILLSTONE-lVlOUNTING.

SPECIFICATION forming part of Letterslatent No. 246,560, dated August 30, 1881.

y Application filed May 11, 1881. (No model.)

county of Brooke, State of West Virginia,

have invented or discovered a new and usefulv Improvementin Millstone-Mountings; and I do hereby declare the following to be a full, clear,

concise, and exact description thereof, reference being had to the accompanying drawings, making a part of this specificationin which, like letters indicating like parts- Figure l is a perspective view of such part-s of a run of burr-millstones and devices for operating the same as serve to illustrate my invention. Fig. 2 is a similar view of adetached portion of the operating mechanism, illustrating modifications in the application of my invention, as hereinafter described. Fig. Sis a plan view, to a larger scale, of the bushing or upper spindle-bearing. Fig. Ltis a perspective view of the follower employed in such bushing.

In grinding iiour from wheat the aim ofthe miller is to produce a comparatively large proportion of middlings of uniform grade with as little cutting or abrasion of bran as possible.

An essential condition to the securing of these results is a steady and true running of the stones, without which no degree of mechanicalskill can secure a uniform product or the best grlndlng.

Several disturbing iniluences are alwaysl more or less present in grinding withordinarymillstones, such as unequal feed, imperfections in driving or running mechanism, and imperfect dress of the stones, which latter causes the meal to heap up and wedge between the grinding-faces of the stones, and this heaping up tends to give the runner a wabbling or unsteady motion, which, in turn, imparts to the spindle a vertical vibration. As the bridgetree on which the upper stone is carried has heretofore been made and supported it not only permitted such vertical vibration to take place, but, on account of its lever action in adjusting the stones, it has operated somewhat as a spring-bar, inviting and intensifying such vibrating rather than preventing it.

I will now describe the improvements by which I prevent this irregularity in the running stone.

In the drawings, A and B represent an upper and lower millstone having their faces formed in accordance with an invention which` I have described in a separate application for a patent. l

f' D is the husk or frame supporting the bedstone; G, the spindle,G',adrivingpulley; H,

the bridge-tree; i, the step and grease-pot; i', set-screws for adjusting the spindle, or wedges lo around the bridge-tree may be employed for this purpose. These parts, with lighter screw E, for adjusting the stones, are substantially such as are and have been long in use, except that I support the bed-stone B on its four sides t upon the cross and side timbers, d, of the husk,

in order to secure the rmest possible Asupf port, and thereby prevent yielding of the bedstone from changes of feed or other disturbing der the spindle C. This support has a broad bearing, s, resting against the bri d ge-tree, and its foot has a screw-thread, s', cut on it, and a nut, S, works thereon, which is arranged to bear against and turn upon a bed-plate, s2,

yrmly set in the )valli o f masonry K. Then by turning the nut Sf'the support S may be raisedandloweredor extended and shortened. Shaftsand gearing S24 S3 may be employedfor con-` veniently turning nut S. In this way the support S can be easily adjusted for changes re' sultin g from varying temperatures, changes in.A

position of the-bridge-tree, and the like, so as at .all times toA give a firm bearing to the spindle, and through it to the stone above.` `The advantages derived from such an adjustable'solid support for preventing tremors and! vibrations cannot be overestimated, and when arranged as I have shown it may be used to advantage to adjust the stones for different grades of grinding. In such cases I fasten the ends of the bridge-tree H, as by wedges It and bolts 7c, lirmly as' against upward movement, by preference at or a little below the position for producing the finest grinding, andthen jack or screw up the support S until the center of the bridge-tree, or that point of it carrying the spindle C, is raised or sprung up sufciently to raise the runner the desired distance. The tension thus imposed upon the bridge-tree has a useful effect in preventing tremor and shaking, and the range of adjust- IOO ment for ordinary grinding being very small, abundance of motion can be obtained in this way. In case it is desired to raise the upper stone beyond the ordinary range, thc wedges h' and bolt k may be loosened, as required.

In Fig. 2 I have shown the spindle C driven by bevel-gearing F from ashaft, F. S represents my adjustable support placed under the bridge-tree and shaft-bearing to impart or secure the requisite stability to the stone; and in order to adjust the stone up and down without disturbing the shaft-bearin g, I set the step and pot t' in a box or hole in the upper side of the bridge-tree, and rest them on the upper fiat face of a wedge, l), which works in or passes through a mortise cut sidewise through the bridge-tree. The under side of the wedge is beveled or inclined, so that by pushingitin or out the step will be raised or lowered, as desired, while a solid bearing is had for the stone directly under the spindle. The wedge may be operated by a stem, p, threaded, as at p', and carrying a correspondin gl y-threaded wheel p2, which is held in position between two plumber blocks or posts, P. Turning wheel p2 by wormshat't P2 or otherwise will give motion to the wedge, as desired.

. I do not limit this part of my invention to any particular form of bridge-tree or spindlesupport, as by obvious modifications it can be adapted to any of the different forms of such devices in use.

So far as I am aware, my invention is the first to afford or secure support directly under the spindle solid but adjustable and independentofthe supporting frame-workof the stones.

Another fruitful source of disturbance in running tlie stone is the wearing away and consequent loosening ot' thebushing or upper spindie-bearing in the eye of the bed-stone.

I have found that a follower made ot' plates of leather bound tightly face upon face and shaped on their edges to the form ot' the spindle, when arranged in the bushing as in Fig. 3, not only affords the requisite firmness, tightness, and freedom from friction, but also, in point of durability, it is far superior to the bushing in common use. I have shown such a follower at R, Fig. 4. It is made by piling several plates or layers of sole-leather or other heavy leather face to face and fastening them temporarily, if desired, by pegs r. When the desired thickness is secured the whole maybe bound firmly by a bolt, r. One edge, r2, of this pile is shaped to fit one-quarter of the circumference of the spindle, and the other three edges are given the usual form adapted to bear against the usual keys or wedges, R', so that four of these followers may be arranged around the spindle and keyed in place by such keys or wedges.

It is to be understood that other appliances, such as are in ordinary use in the operation of Inillstones, are to be added, especially for balancing and driving the upper stone.

I have found by actual test in my own mill that with the improvements herein described applied to millstones they are practically free from the vertical vibrations or irregularities of motion hereinbefore described.

I make no claim herein to the features of construction in the leather follower described, as the same, in so far as they contain patentable invention, will formv the subject-matter of a separate application.

I claim herein as my invention- 1. I n combination with the bridge-tree and spindle of a run of millstones, an adjustable or extensible support havingr a bearin g against the bridge-tree directly under the spindle, and a foundation-bearing independent ofthe huskframe, substantially as set forth. 2. Asa means of adjusting an upper millstone, and in combination therewith and with the' spindle, a bridge-tree, H, rigidly secured at its ends as against upward pressure, and an extensible or adjustable support, S, arranged to bear against the under side of the bridgetree, and by bending or springing the bridgetree upward hold it under tension and raise the stone, substantially as set forth.

3. The combination of runner A, spindle C, and step t', bridge-tree H or equivalent spin- (lle-support, a solid support, S, under the bridgetree and independent of the husk-frame, and an adjustable bearing, P, under the stop, substantially as set forth.

In testimony whereofI have hereunto set my hand.

BENJAMIN D. SANDERS.'

Witnesses:

J. D. SANDERS, T. V. MEEK. 

